Wednesday, 15 October 2014

The most seasoned known application of
a chain drive shows up in the Polybolos, a rehashing crossbow
portrayed by the Greek engineer Philon of Byzantium. Two level joined
fastens were associated with a windlass, which by slowing down and
forward would consequently fire the machine's bolts until its
magazine was vacant. The Greek outline denote the start of the
historical backdrop of the chain drive since no prior occurrence of
such a cam is referred to, and none as perplexing is known until the
sixteenth century. It is here that the level connection chain,
regularly ascribed to Leonardo da Vinci, really showed up. The
principal chain drive in China was delineated in the composed
horological treatise of the Song Dynasty Chinese engineer Su Song,
who utilized it to work the armillary circle of his galactic clock
tower and also the clock jack puppets displaying the time of day by
mechanically blasting gongs and drums. The chain drive itself was
given force through the water driven works of Su's water clock tank
and waterwheel, the last which went about as an extensive rigging.

Thursday, 16 January 2014

A chain is a series
of connected links which are usually made of metal. A chain may contain two or
more links.

Chains are
generally made in one of two styles, as per their intended use:

·Those intended
for lifting, such as when employed with a hoist; for pulling; or for safety,
such as with a bicycle lock, have links that are torus shaped, which make the
chain flexible in two dimensions (The fixed third dimension being a chain's
length.)

·Those intended
for carrying power in machines have links planned to interconnect with the
teeth of the sprockets of the machine, and are flexible in only one dimension.
They are identified as roller chains, though there are also non-roller chains
such as block chain.

Two separate
chains can be linked using a quick link which looks like a carabiner with a
screw close rather than a latch.